WELL · 42-461-30206 · DISTRICT 7
Mobil-Cook #3
Upton County · Heluma East (Devonian) field · Vertical
Mobil-Cook #3 (API 42-461-30206) is a well in Upton County operated by Extex Operating Company, completed February 14, 1985.
The RRC has issued one drilling permit, issued February 19, 1991, permitted to 10,565 ft.
It was permitted by Oryx Energy Company and has since transferred to Extex Operating Company on the wellbore schedule.
Completion filings report 8 formation tops, including Cisco, Strawn, Devonian, Silurian (undifferentiated).
Its 2 leases have reported 317K barrels of oil and 3.35M mcf of gas since January 1993, last reporting in July 2026. The leases carry 7 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Oryx Energy Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jan 7, 2026
- Permits on file
- 117
- Phone
- (713) 953-0824
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Extex Operating Company |
| Production reports | Extex Operating Companythrough Apr 2026 |
| Latest permit | Oryx Energy CompanyFeb 19, 1991 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,565
- total depth, ft
- 1
- permits on file
- Feb 19, 1991
- last permit issued
- Feb 14, 1985
- completed
- 317K
- cumulative oil, bbl
- 3.35M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Feb 14, 1985
- Shut in
- —
- Plugged
- —
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 7 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mobil-Cook O-9-6330 | Heluma, East (Devonian) | Extex Operating Company | 6 | 310K | 3.28M | Jan 1993 – Jul 2026 |
| Mobil Cook O-9-13323 | Heluma (Penn.) | Samson Lone Star LP | 1 | 7.2K | 65.5K | Jan 1993 – Apr 2000 |
Oil, barrels lease total
Last 12 months 4,745 · prior 12 5,045(-6%)
Gas, mcf lease total
Last 12 months 20,057 · prior 12 28,199(-29%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Oryx Energy CompanyJan 1993 → Mar 1995
- 2Samson Hydrocarbons CompanyApr 1995 → Jul 1996
- 3Samson Lone Star LPAug 1996 → Jun 2007
- 4Samson Lone Star, LLCJul 2007 → Dec 2010
- 5Three Rivers Operating Co LLCJan 2011 → Jul 2012
- 6COG Operating LLCAug 2012 → Dec 2012
- 7Legacy Reserves Operating LPJan 2013 → Jan 2021
- 8Extex Operating CompanyFeb 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 384734-99 | Recompletion | Oryx Energy Company | Feb 19, 1991 | Feb 19, 1991 | Jul 29, 1992 | 10,565 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-6330 | — | — | — | — |
| — | — O-9-6330 | — | — | — | — |
| — | — O-9-13323 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,853 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Cisco | 7,523 | -4,670 |
| CiscoCISCO (PENN) | 7,523 | -4,670 |
| StrawnSTRAWN DET | 7,780 | -4,927 |
| StrawnSTRAWN DET. | 7,780 | -4,927 |
| Devonian | 8,137 | -5,284 |
| Silurian (undifferentiated)SILURIAN | 9,310 | -6,457 |
| Fusselman | 9,340 | -6,487 |
| Montoya | 9,431 | -6,578 |
| McKee | 9,778 | -6,925 |
| Ellenburger | 10,375 | -7,522 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,633 | 7,886 | Perforated |
| 8,020 | — | Perforated |
| 8,183 | 8,228 | Perforated |
| 8,183 | 8,792 | Perforated |
| 8,523 | 8,792 | Perforated |
| 10,408 | — | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 510 | 17.5 | 500 S |
| 9.625 | 3,800 | 12.25 | 1,200 S |
| 7 | 10,564 | 8.5 | 560 S |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | May 8, 2000 | Feb 15, 2000 | — |
| 00 | Nov 20, 1992 | Sep 21, 1992 | Yes |
| 00 | Oct 6, 1992 | Feb 28, 1985 | — |
| 00 | Oct 6, 1992 | — | — |
| 00 | Mar 8, 1985 | Feb 28, 1985 | — |
| 00 | Jan 12, 1984 | Dec 31, 1976 | — |
| 00 | Jan 12, 1984 | Mar 20, 1974 | — |
| 00 | Jan 12, 1984 | Feb 7, 1974 | — |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-461-30206 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-30206 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. then paste it into their search.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/46130206, documented in the API reference.